Temperature Range

One of LCD display weakness is its limitation of temperature range. Liquid crystal is a state between liquid and crystal. If the temperature above liquid crystal’s clearing point, it changes to liquid, there will be no display, when the temperature cools down, it will change back to liquid crystal. The process is reversible without damaging the LCD. But if the temperature goes below liquid crystal’s S-N (smectic to nematic) point, the crystalline will damage the orientation layer permanently. The process is irreversible.

Even the temperature range is within the liquid crystal state, when the temperature is lower, the LCD device will have slow response and reduced contrast, while the temperature is higher, the LCD will have current increase, reduced contrast, and background color change (for STN LCDs).

When selecting a Liquid Crystal Display Module or LCD Glass, it is very important to identify the range of the environmental temperature. There are several temperature ranges to choose from:

Standard Temperature Range

The LCD will be used in door, short time outdoor, commercial use. Some of our standard products belong to this category:

Operation Temperature: 0°C – +50°C

Storage Temperature: -20°C – +60°C

Extended Temperature Range

The LCD will be used for industrial use, extended temperature outdoor but eventually will be indoor use or medical use. Most of our standard products belong to this category:

Operation Temperature: -20°C – +70°C

Storage Temperature: -30°C – +80°C

Wide Temperature Range

The LCD will be used outdoor most of time or in harsh environment, such as automotive, military, utility meters etc. The LCD displays have to be custom made for wide temperature as material ranges are broad. Different material can be chosen for different applications. For some applications, heater has generally, the temperature range shows as below: